/*
copyright xu(xusiwei1236@163.com), all right reserved.

Ugly Number
============

Write a program to check whether a given number is an ugly number.

Ugly numbers are positive numbers whose prime factors only include 2, 3, 5. For example, 6, 8 are ugly while 14 is not ugly since it includes another prime factor 7.

Note that 1 is typically treated as an ugly number.

Credits:
Special thanks to @jianchao.li.fighter for adding this problem and creating all test cases.
*/

bool isUgly(int num) {
    if(num == 0) return false;
    while(num != 1) {
        if(num % 2 == 0) {
            num /= 2;
        }
        else if(num % 3 == 0) {
            num /= 3;
        }
        else if(num % 5 == 0) {
            num /= 5;
        }
        else return false;
    }
    return true;
}
